Variable-delivery pump and injector.



I. G. ZUBER. VARIABLE DELIVERY PUMP AND INIECTOR.

APPLICATION FILED MAYIZ. ISIS. I

Patented Mayl an santas Parana canton."

JOHN G. ZUBER, OF CHICAGO, ILLINOIS.

VARIABLE-DELIVERY PUMP AND INJECTOE.

melissa.'

Specification of Letters Patent.

l Application filed May 12, 1916. Serial No. 97,047.

To all whom t 'may concern Be it known that I, JOHN Gr. ZU-Bnii, a citi zen of the United States, and a resident of Chicago, countyl of Cook, and State of Illi nois, have invented certain new and useful 'Improvements in Variable-Delivery Pumps and Injectors, 'of which the following is declared to be a full, clear, and exact description.

' fully set forth and claimed.

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The invention is clearly illustrated in the accompanying drawing, in which Figure 1, is a.view partly in end elevation and partly in cross section of a variable delivery punp and injector, embodying a simple form of the present invention, the line of section being indicated at 1--1, in Figs. 2 and 3; Fig. 2, is a vertical section taken on line 2-2,Fig. 1; Fig. 3, is a horizontal section taken on line 3-3, Fig. 1, and Fig. 4, isa vertical cross section of a slightly modified form of the invention.

Referring to said drawing, 10, designates a case in which are contained the operative parts of the device, and if desired said case may be filled or partly filled with a lubri-l cant for the purpose of lubricating certain moving parts.

On the inner side of one wall 11, of the case vare formed three cylinders or hollow bosses 12', 13, 14, the bores of which receive plungers 15, 16, 17, that are reciprocated and forth in said bosses in timed relation to each other by shafts 18, 19, 20, and cams, cranks, or eccentric connections 21, 22. The outerendsof the plungers 15, 17, are seated in bearings formed in lugs 22a, carried by ,the Wall 23, of the case or in any other convenient manner as desired. The connections between the shafts 18, 20, and plungers 15, 17, may, for the sake of obtaining the greatest accuracy This invention relates to variable delivery 29, 30, 31, being shown in the in measuring the quantity of liquid to be delivered, comprise scotch yoke devices as shown, and in the drawing the plungers 15, 17, are shown as formed with yokes 24, in which are guided, slide blocks 25, that receive eccentrics 26, mounted on or carried by the shafts 18, 20. rlhe plunger 16, is shown as formed with a head or enlargement 27, upon its outer end, which is struck by the cam 22, on the cam shaft 19, otherwise said plunger 16, is freely movable in the bore of its cylindrical boss. Each of said bosses is provided on its end with a stuffing box 28, t0 make tight a joint around the plunger and prevent leakage of the liquid at that end of the boss. The cam shaft 19, is the main or driving shaft of the device and is driven from the motor or other device upon which it is used and in timed relation thereto, and the shafts 18, 19, 20, are operatively connected to rotate in unison and atthe same speed, spiral gears drawing for accomplishing this result. The gears 29, 31 are fast upon their shafts 18, 20, but the gear'30, is slidably mounted on its shaft 19, and is connected to it by a key 32, which runs in a key seat 33, in the shaft. A fork 134, on a rod 35, and engaging with a grooved neck 36, on the gear 30, provides convenient means for shifting said gear on the shaft.

One of the gears 29, 31, is a right hand spiral tooth gear and the other a left hand one, and the gear 30, is formed with right and left hand spiral teeth, the teeth of one gear 29, meshing one set of teeth of the gear 30, and the teeth of gear 31, meshing with the other set of teeth on said gear 30; the resultis that rotation of the cam shaft and the gear thereon drives the gears 29, 31, and shafts 18,20, in the same direction, at the same speed, and by shifting the gear 30,

` lengthwise on its shaft, the shafts 18, 20,

the supply pipe and bore 14, of the cylindrical boss 14, opening toward said bore. The inlet passage 37, leads to the bore 13,

Patented May i, reis.

of the ejection cylinder, by Way of a port 40, (see'lTig. 2) at which port 40, is a check valve 41, opening toward said ejector cylinder 13. From the bore 13a, of the ejector cylinder leads a discharge port 42, which is closed by a suitably operated valve 43, and said discharge port 42, communicates with thedischarge or delivery pipe 44. For convenience, the valve 43, is shown as comprising a check' valve, although it may be.

mechanically operated to openand close, and when a check valve is used the spring 43a, thereof has sufficient tension to hold the check valve 43, closed during the charging strokes of the plungers 15, 17-tliat-is while theyare charging the chamber of the cylinder 13, and the discharge port 42. l

When used for feeding liquid fuel to internal combustion engines the supply pipe is connected with a source of liquid fuel, and the discharge pipe connected with the coinbustion chamber or cylinder of the4 engine;

the cam shaft is driven from said engine to run at the proper speed relative thereto. In operation, the cam shaft 19, is-dr'iven in the direction of the arrow (see Fig. 1) and the shafts 18, 20, driven in the direction of the arrows, through the instrumentality of the spiral gears 29, 30, 31, thereby imparting reciprocatory movements to the two plungers 15, 17. The drawing shows the charging plungers 15, 17, on their suction strokes; liquid fuel 'is drawn into the bores of the cylinders 12, 14, filling the space behind the plungers and at the same time the liquid fuel flows past the check valve 39, into the inlet passage a37, thereby filling it. On their charging stroke the plungers force the amount of liquid fuel, which was admitted to the inlet passage, through the port 37, past the check valve 41', and into the ejection cylinder bore 13, and discharge port 42, the check valve 44 remaining closed during the charging of` said cylinder and port under the influence of the spring 43, thereby forcing ythe ejection 'plunger 16,

back toward the cam 22, where it remains Vtrics remain or run parallel with each other,

the plunger strokes are coincident and therefore they reach the ends of theirstrokes at the same tiine and consequently maximum e charge is takenin and expelled. This is the vposition of the eccentrics shown in the drawing; to decrease the charge the gear 30,

isshifted toward the right (as .viewed in f Leases@ Fig. 2) whereupon one of the shafts 18, 29, is retarded, and the other advanced, thereby changing the angular relation between the major axes of the eccentrics, and the shafts will lcontinue to rotate in this changed relation so long as the gear is held in its new position. The effect of the ade vanced and retarded relation of the shafts 18,20, is that one of the charging plungers reaches the ends of 1its strokes before the other one does; consequently, during the interval that the other plunger is finishing its stroke, the first one is on its return stroke and each plunger is counteracting the eect of the other. When the retarded plunger has reached the end of its stroke and begins its return stroke, both become effective and during suction strokes take liquid into the cylinders and during discharge strokes expel it into the ejection cylinder. When the gear 30, is moved far'enough to bring the"` major axes of the eccentrics 180 degrees apart from the position shown, one lplunger neutralizes the action fthe other and consequently no charge is taken in.

In modified form, illustrated in Fig. 4, diaphragme 15b, are substituted for the plungers 15, 16, 17 of the preferred form, which may be operated by the scotch yokes and cam. In this form the liquid is drawn into the diaphragme and expelled by'expanding and contracting them in the usual manner. i

The device has been illustrated for use on one cylinder, but when the engine has 'a plurality of cylinders, the pumping means may be multiplied accordingly and all operatively connected to the shafts 18, 19, 20, in accordance with the arrangement shown.

More or less variation ofthe exact details of construction .are possible Without departing from the spirit of this invention; l desire, therefore, not to. limit myself to the eziact' forms of the invention shown and described herein, but intendv in the following claims to point out all .of the invention disclosed herein.

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.l claim as new and desireto secure by Letters Patent l. A variable delivery pump and injector, comprising in combination, two chambers in which the liquid is measured, plungers having fixed lengths of strokes reciprocating therein, means for reciprocating saids plungers,u controlling meanslfor timin the strokes of said plungers, an ejector c amber in communication with said measuring chambers having a. valve controlled dis charge port, a plunger in said ejector chamber and operatin means for said plunger.

2. A variable eli'very pump and injector,

comprising in combination, two' communi` i cating charging cylinders having valve controlled inlet and discharge ports, plungers, one reciprocating in eachl cylinder, operating means for reciprocating said plungerswith constant strokes, means for varying the timing of Vsaid plungers, an ejection cylinder in communication with the discharge' port of the charging cylinders, a plunger in said ejection cylinder, operating means therefor, and a valve controlled discharge port for said ejection cylinder.

3. A variable delivery pump and injector', comprising `two charging cylinders, having .valve controlled inlet and discharge ports,

-comprising in combination,

plungers, one reciprocating in each cylinder, operating means for said pistons, and controllable means for changing the timing of strokes of said plungers to vary the volume of liquid displaced, an'ejector cylinder in communication with said charging cylinders, having a valve controlled discharge port, a plunger in said ejector cylinder, and operating means therefor. y

4. A variable delivery pump and injector, comprising two charging cylinders, opening to a valve controlled inlet passage, a plunger in each cylinder, an ejector cylinder connecting with said inlet charging cylinders, and having a valve controlled discharge port, a plunger in said ejector cylinder, a main drive shaft, a cam thereon for actuating the ejector cylinder piston, two 'shaft-s driven from said irst named shaft, leccentric connections between said two shafts and the charging cylinder plungers, and means for-varying the angular relation between the eccentrics.

5. A variable delivery pump and injector,

two intercommuiiicating charging chambers, an ejector chamber in communication therewith, means for admitting a charge to each charging chamber and discharging it into the ejector chamber, means for varying the size of said charging chambers to thereby vary the volume of charge admitted, and comprising reciprocatory plungers., yhaving constant lengths of strokes,and means for discharging the charge fromv the-ejector chamber.

6. -A variable delivery pump and-injector, comprising an inlet passage, two intercom-- municating chargingcha-mb'ers and an ejector chamber communicating therewith, mechanism associated with said charging Vsage to said ejector ejection chamber and means for ejecting' said measured charges chamber.

7. A variable delivery pump and injector, comprising an inlet passage, two charging cylinders communicating therewith, reciprocatingplungers in :said cylinders, reciprocating mechanism for said plungersrhaving correlated timing means,l an ejector cylinder, communicating with said inlet passage, a plunger therein movable in one direction under the influence of liquid pressure within its vcylinder and plunger actuating means for said last mentioned plunger.

8. A variable delivery pump and injector, comprisingtwo intercommunicating liquid measuring chambers, mechanism for charging said cylinders and discharging the contents from said cylinders, reciprocatory plungersjtherein having constant lengths of strokes, an ejector chamber communicating with said. charging chamber, mechanism for discharging the contents of said ejector chamber in timed relation, to the -charging cylinder mechanism.

9. A variable delivery pump ,and injector,

from said ejection comprising a valve controlled inlet passage,

two charging cylinders communicating therewith, and an ejector cylinder communicating with said inlet passage, there being a check valve opening from said inlet pascylinder, and a valve opening outward in the discharge passage of said vejector cylinder, plungers in said cylinders, three shafts, eccentric connections between two of said shafts and the pluners of the charging cylinders, a cam on the third shaft for actuating the plungers of the ejector cylinder, a right and left spiral toothed gear slidably connected with said third shaft, a right gear mounted on one of the other shafts and a left hand spiral toothed gear mounted on the other shaft in mesh with the rightand left spiral toothed gear, and means for shifting said last mentioned gear on its shaft.

JOHN Gr. jZUBER.

comprising two' hand spiral toothed 

